Lindsay Tomlinson, Mark A Tirmenstein, Evan B Janovitz, Nelly Aranibar, Karl-Heinz Ott, John C Kozlosky, Laura M Patrone, William E Achanzar, Karen A Augustine, Kimberly C Brannen, Kenneth E Carlson, Jeffrey H Charlap, Katherine M Dubrow, Liya Kang, Laura T Rosini, Julieta M Panzica-Kelly, Oliver P Flint, Frederic J Moulin, John R Megill, Haiying Zhang, Michael J Bennett, Joseph J Horvath
Ibipinabant (IBI), a potent cannabinoid-1 receptor (CB1R) antagonist, previously in development for the treatment of obesity, causes skeletal and cardiac myopathy in beagle dogs. This toxicity was characterized by increases in muscle-derived enzyme activity in serum and microscopic striated muscle degeneration and accumulation of lipid droplets in myofibers. Additional changes in serum chemistry included decreases in glucose and increases in non-esterified fatty acids and cholesterol, and metabolic acidosis, consistent with disturbances in lipid and carbohydrate metabolism...
October 2012: Toxicological Sciences: An Official Journal of the Society of Toxicology